From: "injekt (Lee Jarvis)" <ljjarvis@...>
Date: 2013-02-20T01:59:34+09:00
Subject: [ruby-core:52535] [ruby-trunk - Feature #7883] Add Regex#to_proc


Issue #7883 has been updated by injekt (Lee Jarvis).


I like this, and I especially like the modified version from judofyr. You could also do ["abc", 3, "foo", etc].find(&Integer) which is neat, but maybe that's a push in the wrong direction, I'm not sure.
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Feature #7883: Add Regex#to_proc
https://bugs.ruby-lang.org/issues/7883#change-36624

Author: rklemme (Robert Klemme)
Status: Open
Priority: Normal
Assignee: 
Category: core
Target version: 1.9.3


Just a small addition to the standard library:

class Regexp
  def to_proc; lambda {|s| self =~ s} end
end

With that one can use a Regex everywhere a Proc is used as filtering criteria saving a bit of typing.  While we have Enumerable#grep already there may be other cases where you want to do something like

irb(main):008:0> %w{foo bar baz}.select &/\Ab/
=> ["bar", "baz"]
irb(main):009:0> %w{foo bar baz}.reject &/\Ab/
=> ["foo"]
irb(main):010:0> %w{foo bar baz}.find &/\Ab/
=> "bar"

Note: line 9 and 10 are not possible with Enumerable#grep AFAIK.

I see low risk of breaking something.


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